Valve for ventilation of a tank

A ventilation valve for ventilation of a tank containing a liquid where a liquid surface fluctuates over time at the same time as the ventilation valve obstructs external liquid from entering into the tank through the ventilation valve, the ventilation valve comprising:

• a structural main housing containing a valve module and respective ventilation channels providing open communication between the tank and the atmosphere, the valve module comprising a movable float body obstructing liquid ingress into the tank through the ventilation valve;
• wherein the valve module comprises a valve housing, wherein the movable float body is received in the valve housing;
• wherein the structural main housing comprises a socket part and a cover part for attachment to the socket part, said cover part being releasably arranged in order to provide access to the replaceable valve module;
• wherein the valve module is clamped between the cover part and the socket part and can be pulled out when the cover part is released from the socket part;
• wherein the respective ventilation channels to the atmosphere are established between the replaceable valve module and the releasable cover part when the releasable cover part is arranged on the socket part in its operating state;
• wherein the ventilation channel towards the atmosphere extends through a bottom of the valve module;
• and
• wherein external water that might enter through the same ventilation channel elevates the movable float body to seal against the valve module and prevents inflow to the tank.